Method of connecting- the action



UNTTED STATES ENT CFFTCE.

B. H. BARTOL, OF COLD SPRING, NEW YORK.

METHOD OF CONNECTING THE ACTION 0F CUT-OFF AND STEAM VALVES.

Specification of Letters Patent No. 3,755, dated. September 20, 1844;Antedated March 20, 1844.

To all whom t may concern Be it known that I, BARNABAS H. BARTOL, ofCold Spring, in the county of Putnam and State of New York, haveinvented a new and useful improvement in methods of regulating theadmission of steam into the cylinders of steam engines, commonly knownas a cut-off valve and I do hereby declare that the following is a full,clear, and eXact description of the construction and operation of thesame, reference being had to the annexed drawings, making a part of thisspecification, in which- Figure l is a longitudinal section. Fig. 2 is atop view. Figs. 3 and 4 transverse sections of cut oif and steam valves.

Description-Fig. l: L is a passage for the admission of steam into thatpart of the steam chest marked K containing the cut ott' valve A. A, isthe cut off valve having three steam passages through it o 0 0 whichwhen directly over N N N allow the steam free passage into the lowerpart of the steam chest marked J. B is a plate secured between K and Jthe upper and lower steam chests having three passages N N N through it.(It. is not necessary that this plate should be separate itI may be apart of K or J H is the steam valve. I is the seat or face on which itworks FX1 FX2 steam passages leading to cylinder. Q the passage for theexhaust steam. G the stem or spindle by which the valve H is moved. M isa guide for supporting G. E is an arm which is firmly attached to Gr.The upper end of E is arranged so as to allow C the stem of the cut oil'valve A, to pass through it freely.

DXl- DX2 are sliding cams or stops which on i being put in particularposition cause the cut off valve A to open and shut as may be desired. FF are set screws for securing D 1 DX2 in place.

Fig. 2, is a top view of steam chest valve stems, etc. The lettersmarked in this figure refer to the parts in Fig. l having the sameletters.

Fig. 3, is a transverse section of cut off valve.

Fig. 4, is a `transverse section of steam valve.

The method of constructing the cut ott valve and seat is to make thesteam passages in them one half the width of the steam passages leadingto the cylinder, or one fourth of the whole throw, or movement of theeccentric of the steam engine.

The operation of the cut off valve is as` follows. The valve stem Gr isshown in the drawing on its passage out as indicated by the arrow. WThenthe edge of the steam valve H has advanced to the edge of the openingFX1, the arm E will have reached the cam D) 1 when the cut off valve Awill move at the same velocity as the steam valve H the two valves A andH then open together, when the steam passage FX1 is half open, thepassages 0 0 0 are directly over N N N, and as the valves proceed on,when the passage FX1 is full open those in A have just closed, cuttingoff the steam from the cylinder at about one half the stroke. The valveH now moves back, and when the arm E reaches the cam DX2 the same effectis produced on the opposite side, by moving DXl DX2 nearer together,steam may be cut off at any desired point, less than one half the strokeof the piston, and by moving them farther apartl the passages 0 0 0 maybe brought directly over N N N and kept in that position as the arm Ewill move between DX DX2 wit-hout touching.

What claim as constituting my invention and desire to secure by LettersPatent, is

he manner in which I have combined the action of the cut-off and steamvalves, by means of the arm E attached to the stem of the steam valve,and the movable, or sliding cams, or stops, made adjustable on the stemC, of the cut oft` valve, for the purpose of regulating the cut-ting ottof the steam, by the action of the respective parts as herein describedand made known.

BARNABAS H. BARTOL.

Witnesses:

S. F. BARRows, D. NELSON.

